4 research outputs found

    Redescription of Paracobitis rhadinaea (Regan, 1906) from Sistan Basin, Iran (Teleostei: Nemacheiliidae)

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    Paracobitis rhadinaea, a member of the family Nemacheiliidae, originally described by Regan in 1906 from Sistan basin, is poorely known by the rare materials. The inadequately studied species is redescribed on the base of freshly collected materials. The species differs from all other Paracobitis species by combination of the following characters: stout and elongated body; large size, up to 288 mm; a fully squamated body; slit like posterior nare; and midlateral series of large, irregular set and shaped dark, brown blotches. P. rhadinaea is endemic to Sistan, Iran

    RASPODJELA I STATUS VIJUNA (Actinopetrigii: Cobitidae) U JUŽNOM SLIVU KASPIJSKOG JEZERA

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    In order to clarify the distribution pattern of Cobitis populations along the southern Caspian Sea basin, 97 specimens collected from five localities were morphologically examined. Univariate analysis of variance showed significant differences (P<0.05) among the means of the five groups for 28 of 33 standardized morphometric measurements and 7 of 10 meristic counts. In the linear discriminant function analysis (DFA) for morphometric characteristics, the overall assignment of individuals into their original groups was high (84.9%), indicating that these populations are highly divergent. The proportion of individuals correctly classified into their original groups were 77.4%, 77.3%, 100%, 100% and 89.5% for Cobitis sp. (Gisum River), Cobitis keyvani (Sefidroud River), C. keyvani (Tonekabon River), Cobitis faridpaki (Siahroud River) and C. keyvani (Talar River), respectively. Clustering based on Euclidean distances among these groups of centroids using UPGMA and principal components analysis (PCA) indicated that the southeastern Caspian spined loach populations are C. faridpaki and the south central ones are C. keyvani and an unknown population, Cobitis sp. is distinguished from the southwestern populations of the basin. Also the Tonekabon and Sefidroud Rivers were determined to be the two new habitats for C. keyvani in the region.Kako bi se razjasnila raspodjela populacije vrste Cobitis u južnom dijelu Kaspijskog jezera, morfološki je ispitano 97 jedinki te vrste, prikupljenih s pet različitih lokaliteta. Jednosmjerna analiza odstupanja pokazala je značajne razlike (P<0,05) između srednjih vrijednosti pet skupina u 28 od 33 standardiziranih morfometrijskih mjerenja, te 7 od 10 merističkih izračuna. Prilikom linearne diskriminantne funkcijske analize (DFA) prema morfometrijskim karakteristikama, ukupna podjela jedinki u njihove izvorne skupine bila je visoka (84,9%), što ukazuje na to da se te populacije znatno razlikuju. Udio pojedinačnih vrsta koje su ispravno klasificirane u svoje izvorne skupine bio je 77,4% kod vrste Cobitis sp. (rijeka Gisum), 77,3% kod vrste Cobitis keyvani (rijeka Sefidroud), 100% kod vrste C. keyvani (rijeka Tonekabon), 100% kod vrste Cobitis faridpaki (rijeka Siahroud) i 89,5% kod vrste C. keyvani (rijeka Talar). Grupiranjem na temelju euklidskih udaljenosti između ovih pet skupina centroida, koristeći rezultate UPGMA i analize glavnih sastavnica (PCA), utvrđeno je da C. faridpaki spadaju u jugoistočne kaspijske populacije vijuna, da C. keyvani spadaju u centralni južni dio jezera te da se nepoznata populacija, Cobitis sp., razlikuje od jugozapadnih populacija sliva Kaspijskog jezera. Rijeke Tonekabon i Sefidroud su dva nova staništa za vrstu C. keyvani u regiji

    The first record of Koi fish, Cyprinus rubrofuscus, from a natural waterbody in the Hormuz basin, southern Iran

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    The number of exotic freshwater ornamental fish species released from the aquarium trade in Iran has been increasing in recent years. The Koi fish has already been reported from Iran, where it occurred in the southern Caspian Sea and Namak Lake basins. This is the first documented record of Cyprinus rubrofuscus from the Hormuz basin in southern Iran, which shows the range extension of this species in Iran. It seems there is no natural predator in most of the Iranian aquatic ecosystems for large Koi specimens. Therefore, the establishment of established populations in the natural lentic habitats is probable. Hence, eradication programs need to be accompanied by a public awareness campaign to ensure that the aquarium trade and hobbyists do not release these pet fishes into natural habitats
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